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v3.25.3

Loss and Loss Adjustment Expense Reserves (Details) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($)
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Prior years | $ 1,068 | $ 199
Personal Lines | Personal auto business |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Prior years | 910 | $ 375
Personal Lines | Personal auto business | Agency |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Percent of prior year claims and claims adjustment expense |  | 0.60
Personal Lines | Personal property |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Prior years | 75 | $ (75)
Commercial Lines |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Prior years | 80 | (100)
Short-Duration Insurance Contract, Accident Year 2024 |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Prior years | 660 |
Short-Duration Insurance Contract, Accident Year 2023 |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Prior years | $ 190 | 160
Short-Duration Insurance Contract, Accident Year 2022 |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Prior years |  | $ 5

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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-3 + Details
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